Configurable RF transmit/receive multiplexer

ABSTRACT

A configurable RF transmit/receive (TX/RX) multiplexer, which includes a group of RF TX bandpass filters, a group of RF TX switching elements, and a group of RF RX bandpass filters; is disclosed. Each of the group of RF RX bandpass filters is coupled to a first common connection node. Each of the group of RF TX switching elements is coupled between a corresponding one of the group of RF TX bandpass filters and the first common connection node, which is coupled to a first RF antenna.

RELATED APPLICATIONS

The present application claims the benefit of U.S. provisional patent application No. 62/036,210, filed Aug. 12, 2014, the disclosure of which is hereby incorporated herein by reference in its entirety.

FIELD OF THE DISCLOSURE

Embodiments of the present disclosure relate to radio frequency (RF) communications systems, which may include RF front-end circuitry, RF transceiver circuitry, RF transmit circuitry, RF receive circuitry, RF diplexers, RF duplexers, RF filters, RF antennas, RF switches, RF combiners, RF splitters, the like, or any combination thereof.

BACKGROUND

As wireless communications technologies evolve, wireless communications systems become increasingly sophisticated. As such, wireless communications protocols continue to expand and change to take advantage of the technological evolution. As a result, to maximize flexibility, many wireless communications devices must be capable of supporting any number of wireless communications protocols, each of which may have certain performance requirements, such as specific out-of-band emissions requirements, linearity requirements, or the like. Further, portable wireless communications devices are typically battery powered and need to be relatively small, and have low cost. As such, to minimize size, cost, and power consumption, RF circuitry in such a device needs to be as simple, small, flexible, and efficient as is practical. Thus, there is a need for RF circuitry in a communications device that is low cost, small, simple, flexible, and efficient.

SUMMARY

A configurable RF transmit/receive (TX/RX) multiplexer, which includes a group of RF TX bandpass filters, a group of RF TX switching elements, and a group of RF RX bandpass filters; is disclosed, according to one embodiment of the present disclosure. Each of the group of RF RX bandpass filters is coupled to a first common connection node. Each of the group of RF TX switching elements is coupled between a corresponding one of the group of RF TX bandpass filters and the first common connection node, which is coupled to a first RF antenna.

Those skilled in the art will appreciate the scope of the disclosure and realize additional aspects thereof after reading the following detailed description in association with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings incorporated in and forming a part of this specification illustrate several aspects of the disclosure, and together with the description serve to explain the principles of the disclosure.

FIG. 1 shows RF communications circuitry according to one embodiment of the RF communications circuitry.

FIG. 2 shows the RF communications circuitry according to an alternate embodiment of the RF communications circuitry.

FIG. 3 shows details of a configurable RF TX/RX multiplexer illustrated in FIG. 1 according to one embodiment of the configurable RF TX/RX multiplexer.

FIG. 4 shows details of the configurable RF TX/RX multiplexer illustrated in FIG. 1 according to an alternate embodiment of the configurable RF TX/RX multiplexer.

FIG. 5 shows details of the configurable RF TX/RX multiplexer illustrated in FIG. 1 according to an additional embodiment of the configurable RF TX/RX multiplexer.

FIG. 6 shows details of the configurable RF TX/RX multiplexer illustrated in FIG. 2 according to one embodiment of the configurable RF TX/RX multiplexer.

FIG. 7 shows details of the configurable RF TX/RX multiplexer illustrated in FIG. 2 according to an alternate embodiment of the configurable RF TX/RX multiplexer.

FIG. 8 shows details of the configurable RF TX/RX multiplexer illustrated in FIG. 2 according to an additional embodiment of the configurable RF TX/RX multiplexer.

FIG. 9 shows details of the configurable RF TX/RX multiplexer illustrated in FIG. 1 and a first RF antenna according to one embodiment of the configurable RF TX/RX multiplexer and the first RF antenna.

FIG. 10 shows details of the configurable RF TX/RX multiplexer illustrated in FIG. 9 according to one embodiment of the configurable RF TX/RX multiplexer.

FIG. 11A shows details of a first group of acoustic-based RF resonators (ABRFR)s illustrated in FIG. 10 according to one embodiment of the first group of ABRFRs.

FIG. 11B shows details of a fifth group of ABRFRs illustrated in FIG. 10 according to one embodiment of the fifth group of ABRFRs.

FIG. 12 shows details of the configurable RF TX/RX multiplexer illustrated in FIG. 2 according to one embodiment of the configurable RF TX/RX multiplexer.

FIG. 13 shows details of the configurable RF TX/RX multiplexer illustrated in FIG. 1 according to one embodiment of the configurable RF TX/RX multiplexer.

FIG. 14 shows the RF communications circuitry according to one embodiment of the RF communications circuitry.

DETAILED DESCRIPTION

The embodiments set forth below represent the necessary information to enable those skilled in the art to practice the disclosure and illustrate the best mode of practicing the disclosure. Upon reading the following description in light of the accompanying drawings, those skilled in the art will understand the concepts of the disclosure and will recognize applications of these concepts not particularly addressed herein. It should be understood that these concepts and applications fall within the scope of the disclosure and the accompanying claims.

A configurable RF transmit/receive (TX/RX) multiplexer, which includes a group of RF TX bandpass filters, a group of RF TX switching elements, and a group of RF RX bandpass filters is disclosed, according to one embodiment of the present disclosure. Each of the group of RF RX bandpass filters is coupled to a first common connection node. Each of the group of RF TX switching elements is coupled between a corresponding one of the group of RF TX bandpass filters and the first common connection node, which is coupled to a first RF antenna.

FIG. 1 shows RF communications circuitry 10 according to one embodiment of the RF communications circuitry 10. The RF communications circuitry 10 includes RF system control circuitry 12, RF front-end circuitry 14, and a first RF antenna 16. The RF front-end circuitry 14 includes a configurable RF TX/RX multiplexer 18, RF receive circuitry 20, and RF transmit circuitry 22. The configurable RF TX/RX multiplexer 18 has a first common connection node CN1, which is coupled to the first RF antenna 16. In one embodiment of the configurable RF TX/RX multiplexer 18, the first common connection node CN1 is directly coupled to the first RF antenna 16. The RF system control circuitry 12 provides a first function configuration signal FCS1 to the configurable RF TX/RX multiplexer 18. As such, in one embodiment of the configurable RF TX/RX multiplexer 18, the RF system control circuitry 12 configures the configurable RF TX/RX multiplexer 18 using the first function configuration signal FCS1.

In one embodiment of the RF system control circuitry 12, the RF system control circuitry 12 provides a first upstream RF transmit signal TXU1, a second upstream RF transmit signal TXU2, and up to and including an M^(TH) upstream RF transmit signal TXUM to the RF transmit circuitry 22. In general, the RF system control circuitry 12 provides a group of upstream RF transmit signals TXU1, TXU2, TXUM to the RF transmit circuitry 22.

The RF transmit circuitry 22 processes the first upstream RF transmit signal TXU1 to provide a first downstream RF transmit signal TXD1 to the configurable RF TX/RX multiplexer 18, the second upstream RF transmit signal TXU1 to provide a second downstream RF transmit signal TXD2 to the configurable RF TX/RX multiplexer 18, and up to and including the M^(TH) upstream RF transmit signal TXU1 to provide an M^(TH) downstream RF transmit signal TXDM to the configurable RF TX/RX multiplexer 18. In general, the RF transmit circuitry 22 provides a group of downstream RF transmit signals TXD1, TXD2, TXDM to the configurable RF TX/RX multiplexer 18.

In one embodiment of the RF system control circuitry 12, the RF system control circuitry 12 selects one of the group of downstream RF transmit signals TXD1, TXD2, TXDM using the first function configuration signal FCS1, such that the configurable RF TX/RX multiplexer 18 processes and forwards the selected one of the group of downstream RF transmit signals TXD1, TXD2, TXDM to the first common connection node CN1 to provide a first RF antenna transmit signal T1A, which is transmitted via the first RF antenna 16.

The RF transmit circuitry 22 may include up-conversion circuitry, amplification circuitry, power supply circuitry, filtering circuitry, switching circuitry, combining circuitry, splitting circuitry, dividing circuitry, clocking circuitry, the like, or any combination thereof to process the first upstream RF transmit signal TXU1. In one embodiment of the RF transmit circuitry 22, the RF transmit circuitry 22 includes circuitry to reduce interference of RF receive signals in the configurable RF TX/RX multiplexer 18 by processing the group of downstream RF transmit signals TXD1, TXD2, TXDM in the configurable RF TX/RX multiplexer 18.

In one embodiment of the configurable RF TX/RX multiplexer 18, the configurable RF TX/RX multiplexer 18 receives any or all of a first antenna, first RF receive signal R1A1; a first antenna, second RF receive signal R1A2; and up to and including a first antenna, N^(TH) RF receive signal R1AN; which are received via the first RF antenna 16. In general, the configurable RF TX/RX multiplexer 18 receives any or all of a group of first antenna, RF receive signals R1A1, R1A2, R1AN from the first common connection node CN1. In one embodiment of the group of first antenna, RF receive signals R1A1, R1A2, R1AN, any or all of the group of first antenna, RF receive signals R1A1, R1A2, R1AN are received simultaneously, such that the configurable RF TX/RX multiplexer 18 supports receive downlink carrier aggregation (RXDLCA).

The configurable RF TX/RX multiplexer 18 processes and forwards any or all of the group of first antenna, RF receive signals R1A1, R1A2, R1AN from the first common connection node CN1 to provide any or all of a first antenna, first upstream RF receive signal R1U1, a first antenna, second upstream RF receive signal R1U2, and up to and including a first antenna, N^(TH) upstream RF receive signal R1UN. In general, the configurable RF TX/RX multiplexer 18 provides any or all of a group of first antenna, upstream RF receive signals R1U1, R1U2, R1UN to the RF receive circuitry 20.

In one embodiment of the RF receive circuitry 20, the RF receive circuitry 20 receives and processes any or all of the group of the first antenna, upstream RF receive signals R1U1, R1U2, R1UN to provide a corresponding any or all of a group of first antenna, downstream RF receive signals R1D1, R1D2, R1DN.

In an additional embodiment of the RF receive circuitry 20, the RF receive circuitry 20 simultaneously receives and processes any or all of the group of first antenna, upstream RF receive signals R1U1, R1U2, R1UN. As such, the RF receive circuitry 20 supports RXDLCA. The RF receive circuitry 20 may include down-conversion circuitry, amplification circuitry, low noise amplification circuitry, power supply circuitry, filtering circuitry, switching circuitry, combining circuitry, splitting circuitry, dividing circuitry, clocking circuitry, the like, or any combination thereof.

In one embodiment of the RF front-end circuitry 14, any or all of the group of first antenna, RF receive signals R1A1, R1A2, R1AN and the first RF antenna transmit signal T1A, any or all of the group of first antenna, upstream RF receive signals R1U1, R1U2, R1UN, any or all of the group of first antenna, downstream RF receive signals R1D1, R1D2, R1DN, any or all of the group of upstream RF transmit signals TXU1, TXU2, TXUM, and any or all of the group of downstream RF transmit signals TXD1, TXD2, TXDM are omitted.

In one embodiment of the RF system control circuitry 12, the RF system control circuitry 12 provides the first function configuration signal FCS1 to the configurable RF TX/RX multiplexer 18, the RF receive circuitry 20, and the RF transmit circuitry 22. As such, the RF system control circuitry 12 may configure, tune, adjust, enable, disable, vary, or any combination thereof, circuits within the configurable RF TX/RX multiplexer 18, the RF receive circuitry 20, the RF transmit circuitry 22, or any combination thereof, as necessary using the first function configuration signal FCS1.

FIG. 2 shows the RF communications circuitry 10 according to an alternate embodiment of the RF communications circuitry 10. The RF communications circuitry 10 illustrated in FIG. 2 is similar to the RF communications circuitry 10 illustrated in FIG. 1, except the RF communications circuitry 10 illustrated in FIG. 2 further includes a second RF antenna 24. Additionally, the configurable RF TX/RX multiplexer 18 further has a second common connection node CN2, which is coupled to the second RF antenna 24.

In one embodiment of the RF system control circuitry 12, the RF system control circuitry 12 selects one of the group of downstream RF transmit signals TXD1, TXD2, TXDM using the first function configuration signal FCS1, such that the configurable RF TX/RX multiplexer 18 processes and forwards the selected one of the group of downstream RF transmit signals TXD1, TXD2, TXDM to a selected one of the first common connection node CN1 and the second common connection node CN2.

If the selected one of the first common connection node CN1 and the second common connection node CN2 is the first common connection node CN1, then the configurable RF TX/RX multiplexer 18 processes and forwards the selected one of the group of downstream RF transmit signals TXD1, TXD2, TXDM to provide the first RF antenna transmit signal T1A, which is transmitted via the first RF antenna 16. If the selected one of the first common connection node CN1 and the second common connection node CN2 is the second common connection node CN2, then the configurable RF TX/RX multiplexer 18 processes and forwards the selected one of the group of downstream RF transmit signals TXD1, TXD2, TXDM to provide a second RF antenna transmit signal T2A, which is transmitted via the second RF antenna 24.

In one embodiment of the configurable RF TX/RX multiplexer 18, the configurable RF TX/RX multiplexer 18 receives any or all of a second antenna, first RF receive signal R2A1; a second antenna, second RF receive signal R2A2; and up to and including a second antenna, N^(TH) RF receive signal R2AN; which are received via the second RF antenna 24. In general, the configurable RF TX/RX multiplexer 18 receives any or all of a group of first antenna, RF receive signals R1A1, R1A2, R1AN from the first common connection node CN1 and any or all of a group of second antenna, RF receive signals R2A1, R2A2, R2AN from the second common connection node CN2.

In one embodiment of the group of first antenna, RF receive signals R1A1, R1A2, R1AN and the group of second antenna, RF receive signals R2A1, R2A2, R2AN, any or all of the group of first antenna, RF receive signals R1A1, R1A2, R1AN and the group of second antenna, RF receive signals R2A1, R2A2, R2AN are received simultaneously, such that the configurable RF TX/RX multiplexer 18 supports RXDLCA.

The configurable RF TX/RX multiplexer 18 processes and forwards any or all of the group of first antenna, RF receive signals R1A1, R1A2, R1AN from the first common connection node CN1 to provide any or all of the first antenna, first upstream RF receive signal R1U1, the first antenna, second upstream RF receive signal R1U2, and up to and including the first antenna, N^(TH) upstream RF receive signal R1UN.

Further, the configurable RF TX/RX multiplexer 18 processes and forwards any or all of the group of second antenna, RF receive signals R2A1, R2A2, R2AN from the second common connection node CN2 to provide any or all of a second antenna, first upstream RF receive signal R2U1, a second antenna, second upstream RF receive signal R2U2, and up to and including a second antenna, N^(TH) upstream RF receive signal R2UN.

In general, the configurable RF TX/RX multiplexer 18 provides any or all of the group of first antenna, upstream RF receive signals R1U1, R1U2, R1UN and the group of second antenna, upstream RF receive signals R2U1, R2U2, R2UN to the RF receive circuitry 20.

In one embodiment of the RF receive circuitry 20, the RF receive circuitry 20 receives and processes any or all of the first group of the first antenna, upstream RF receive signals R1U1, R1U2, R1UN and the group of the second antenna, upstream RF receive signals R2U1, R2U2, R2UN to provide a corresponding any or all of the group of first antenna, downstream RF receive signals R1D1, R1D2, R1DN and a group of second antenna, downstream RF receive signals R2D1, R2D2, R2DN.

In an additional embodiment of the RF receive circuitry 20, the RF receive circuitry 20 simultaneously receives and processes any or all of the group of first antenna, upstream RF receive signals R1U1, R1U2, R1UN and the group of second antenna, upstream RF receive signals R2U1, R2U2, R2UN. As such, the RF receive circuitry 20 supports RXDLCA.

FIG. 3 shows details of the configurable RF TX/RX multiplexer 18 illustrated in FIG. 1 according to one embodiment of the configurable RF TX/RX multiplexer 18. The configurable RF TX/RX multiplexer 18 includes a group 26 of RF TX bandpass filters, a first group 28 of RF RX bandpass filters, and a first group 30 of RF TX switching elements. Additionally, the configurable RF TX/RX multiplexer 18 has the first common connection node CN1.

The group 26 of RF TX bandpass filters includes a first RF TX bandpass filter 32, a second RF TX bandpass filter 34, and up to and including an M^(TH) RF TX bandpass filter 36. The first group 28 of RF RX bandpass filters includes a first antenna first RF RX bandpass filter 38, a first antenna second RF RX bandpass filter 40, and up to and including a first antenna N^(TH) RF RX bandpass filter 42. The first group 30 of RF TX switching elements includes a first antenna first RF TX switching element 44, a first antenna second RF TX switching element 46, and up to and including a first antenna M^(TH) RF TX switching element 48.

In one embodiment of the first group 28 of RF RX bandpass filters, each of the first group 28 of RF RX bandpass filters is coupled to the first common connection node CN1. As such, the first antenna first RF RX bandpass filter 38 is coupled to the first common connection node CN1, the first antenna second RF RX bandpass filter 40 is coupled to the first common connection node CN1, and the first antenna N^(TH) RF RX bandpass filter 42 is coupled to the first common connection node CN1. In an alternate embodiment of the first group 28 of RF RX bandpass filters, any of the first group 28 of RF RX bandpass filters are omitted. In one embodiment of the first group 28 of RF RX bandpass filters, each of the first group 28 of RF RX bandpass filters is directly coupled to the first common connection node CN1.

The first antenna first RF RX bandpass filter 38 receives and filters the first antenna, first RF receive signal R1A1 (FIG. 1) via the first common connection node CN1 to provide the first antenna, first upstream RF receive signal R1U1. The first antenna second RF RX bandpass filter 40 receives and filters the first antenna, second RF receive signal R1A2 (FIG. 1) via the first common connection node CN1 to provide the first antenna, second upstream RF receive signal R1U2. The first antenna N^(TH) RF RX bandpass filter 42 receives and filters the first antenna, N^(TH) RF receive signal R1AN (FIG. 1) via the first common connection node CN1 to provide the first antenna, N^(TH) upstream RF receive signal R1UN. In general, the first group 28 of RF RX bandpass filters provides the group of first antenna, upstream RF receive signals R1U1, R1U2, R1UN.

In general, the first group 30 of RF TX switching elements is coupled between the group 26 of RF TX bandpass filters and the first common connection node CN1, such that each of the first group 30 of RF TX switching elements is coupled between a corresponding one of the group 26 of RF TX bandpass filters and the first common connection node CN1. Specifically, the first antenna first RF TX switching element 44 is coupled between the first RF TX bandpass filter 32 and the first common connection node CN1. The first antenna second RF TX switching element 46 is coupled between the second RF TX bandpass filter 34 and the first common connection node CN1. The first antenna M^(TH) RF TX switching element 48 is coupled between the M^(TH) RF TX bandpass filter 36 and the first common connection node CN1.

When the selected one of the group of downstream RF transmit signals TXD1, TXD2, TXDM to provide the first RF antenna transmit signal T1A (FIG. 1) is the first downstream RF transmit signal TXD1, the first antenna first RF TX switching element 44 is CLOSED and each of a balance of the first group 30 of RF TX switching elements is OPEN. When the selected one of the group of downstream RF transmit signals TXD1, TXD2, TXDM to provide the first RF antenna transmit signal T1A (FIG. 1) is the second downstream RF transmit signal TXD2, the first antenna second RF TX switching element 46 is CLOSED and each of a balance of the first group 30 of RF TX switching elements is OPEN. When the selected one of the group of downstream RF transmit signals TXD1, TXD2, TXDM to provide the first RF antenna transmit signal T1A (FIG. 1) is the M^(TH) downstream RF transmit signal TXDM, the first antenna M^(TH) RF TX switching element 48 is CLOSED and each of a balance of the first group 30 of RF TX switching elements is OPEN.

FIG. 4 shows details of the configurable RF TX/RX multiplexer 18 illustrated in FIG. 1 according to an alternate embodiment of the configurable RF TX/RX multiplexer 18. The configurable RF TX/RX multiplexer 18 illustrated in FIG. 4 is similar to the configurable RF TX/RX multiplexer 18 illustrated in FIG. 3, except the configurable RF TX/RX multiplexer 18 illustrated in FIG. 4 further includes a first group 50 of RF phase-shifting circuits. The first group 50 of RF phase-shifting circuits includes a first antenna first RF phase-shifting circuit 52, a first antenna second RF phase-shifting circuit 54, and up to and including a first antenna M^(TH) RF phase-shifting circuit 56.

In general, the first group 50 of RF phase-shifting circuits is coupled between the group 26 of RF TX bandpass filters and the first group 30 of RF TX switching elements, such that each of the first group 50 of RF phase-shifting circuits is coupled between a corresponding one of the group 26 of RF TX bandpass filters and a corresponding one of the first group 30 of RF TX switching elements.

Specifically, the first antenna first RF phase-shifting circuit 52 is coupled between the first RF TX bandpass filter 32 and the first antenna first RF TX switching element 44. The first antenna second RF phase-shifting circuit 54 is coupled between the second RF TX bandpass filter 34 and the first antenna second RF TX switching element 46. The first antenna M^(TH) RF phase-shifting circuit 56 is coupled between the M^(TH) RF TX bandpass filter 36 and the first antenna M^(TH) RF TX switching element 48.

In one embodiment of the first group 50 of RF phase-shifting circuits, each of the first group 50 of RF phase-shifting circuits applies an appropriate phase-shift, such that the group 26 of RF TX bandpass filters and the first group 28 of RF RX bandpass filters support full-duplex operation without significantly interfering with one another. In one embodiment of the first group 50 of RF phase-shifting circuits, each of the first group 50 of RF phase-shifting circuits includes a shunt capacitive element coupled to ground.

FIG. 5 shows details of the configurable RF TX/RX multiplexer 18 illustrated in FIG. 1 according to an additional embodiment of the configurable RF TX/RX multiplexer 18. The configurable RF TX/RX multiplexer 18 illustrated in FIG. 5 is similar to the configurable RF TX/RX multiplexer 18 illustrated in FIG. 4, except the configurable RF TX/RX multiplexer 18 illustrated in FIG. 5 further includes a first group 58 of phase-shift switching elements.

The first group 58 of phase-shift switching elements includes a first antenna first phase-shift switching element 60, a first antenna second phase-shift switching element 62, and up to and including a first antenna M^(TH) phase-shift switching element 64. Instead of the first group 50 of RF phase-shifting circuits being coupled between the group 26 of RF TX bandpass filters and the first group 30 of RF TX switching elements, as illustrated in FIG. 4, the first group 58 of phase-shift switching elements is coupled between the first group 50 of RF phase-shifting circuits and the first common connection node CN1. This architecture allows the first group 50 of RF phase-shifting circuits to be used during both receive only conditions and transmit only conditions, as might occur during time-division duplex (TDD) operations.

In general, each of the first group 58 of phase-shift switching elements is coupled between a corresponding one of the first group 50 of RF phase-shifting circuits and the first common connection node CN1, such that during transmission of the first RF antenna transmit signal T1A (FIG. 1) via the first RF antenna 16 (FIG. 1), one of the group 26 of RF TX bandpass filters and a corresponding one of the first group 50 of RF phase-shifting circuits are operationally coupled to the first RF antenna 16 (FIG. 1).

Specifically, the first antenna first phase-shift switching element 60 is coupled between the first antenna first RF phase-shifting circuit 52 and the first common connection node CN1. The first antenna second phase-shift switching element 62 is coupled between the first antenna second RF phase-shifting circuit 54 and the first common connection node CN1. The first antenna M^(TH) phase-shift switching element 64 is coupled between the first antenna M^(TH) RF phase-shifting circuit 56 and the first common connection node CN1. In general, each of the first group 58 of phase-shift switching elements is coupled between a corresponding one of the first group 50 of RF phase-shifting circuits and the first common connection node CN1.

In one embodiment of the configurable RF TX/RX multiplexer 18, during a TDD reception of one of the group of first antenna, RF receive signals R1A1, R1A2, R1AN (FIG. 1) via the first RF antenna 16 (FIG. 1), one of the first group 50 of RF phase-shifting circuits is operationally coupled to the first RF antenna 16 (FIG. 1). In one embodiment of the configurable RF TX/RX multiplexer 18, at least two of the first group 28 of RF RX bandpass filters simultaneously receive and filter a corresponding group of the first antenna, RF receive signals R1A1, R1A2, R1AN (FIG. 1) to provide a corresponding group of first antenna, upstream RF receive signals R1U1, R1U2, R1UN.

FIG. 6 shows details of the configurable RF TX/RX multiplexer 18 illustrated in FIG. 2 according to one embodiment of the configurable RF TX/RX multiplexer 18. The configurable RF TX/RX multiplexer 18 illustrated in FIG. 6 is similar to the configurable RF TX/RX multiplexer 18 illustrated in FIG. 4, except the configurable RF TX/RX multiplexer 18 illustrated in FIG. 6 further includes a second group 66 of RF receive bandpass filters, a second group 68 of RF TX switching elements, and a second group 70 of RF phase-shifting circuits. In addition, the configurable RF TX/RX multiplexer 18 has the second common connection node CN2.

The second group 66 of RF receive bandpass filters is coupled to the second common connection node CN2. Specifically, each of the second group 66 of RF receive bandpass filters is coupled to the second common connection node CN2. The second group 68 of RF TX switching elements is coupled to the second common connection node CN2. The second group 70 of RF phase-shifting circuits is coupled between the group 26 of RF TX bandpass filters and the second group 68 of RF TX switching elements.

The second group 68 of RF TX switching elements includes a second antenna first RF TX switching element 72, a second antenna second RF TX switching element 74, and up to and including a second antenna M^(TH) RF TX switching element 76. The second group 70 of RF phase-shifting circuits includes a second antenna first RF phase-shifting circuit 78, a second antenna second RF phase-shifting circuit 80, and up to and including a second antenna M^(TH) RF phase-shifting circuit 82.

The second antenna first RF phase-shifting circuit 78 is coupled between the first RF TX bandpass filter 32 and the second antenna first RF TX switching element 72. The second antenna second RF phase-shifting circuit 80 is coupled between the second RF TX bandpass filter 34 and the second antenna second RF TX switching element 74. The second antenna M^(TH) RF phase-shifting circuit 82 is coupled between the M^(TH) RF TX bandpass filter 36 and the second antenna M^(TH) RF TX switching element 76.

In general, each of the second group 70 of RF phase-shifting circuits is coupled between a corresponding one of the group 26 of RF TX bandpass filters and a corresponding one of the second group 68 of RF TX switching elements. In an alternate embodiment of the configurable RF TX/RX multiplexer 18, the second group 70 of RF phase-shifting circuits is omitted, such that each of the second group 68 of RF TX switching elements is coupled between a corresponding one of the group 26 of RF TX bandpass filters and the second common connection node CN2.

FIG. 7 shows details of the configurable RF TX/RX multiplexer 18 illustrated in FIG. 2 according to an alternate embodiment of the configurable RF TX/RX multiplexer 18. The configurable RF TX/RX multiplexer 18 illustrated in FIG. 7 includes the first group 30 of RF TX switching elements, the first group 50 of RF phase-shifting circuits, and the first group 58 of phase-shift switching elements configured as illustrated in FIG. 5. The first group 30 of RF TX switching elements, the first group 50 of RF phase-shifting circuits, and the first group 58 of phase-shift switching elements are not shown in FIG. 7 to simplify FIG. 7. Additionally, the configurable RF TX/RX multiplexer 18 illustrated in FIG. 7 further includes the second group 68 of RF TX switching elements, the second group 70 of RF phase-shifting circuits, and a second group 84 of phase-shift switching elements.

The second group 84 of phase-shift switching elements includes a second antenna first phase-shift switching element 86, a second antenna second phase-shift switching element 88, and up to and including a second antenna M^(TH) phase-shift switching element 90. Each of the second group 68 of RF TX switching elements is coupled between a corresponding one of the group 26 of RF TX bandpass filters and the second common connection node CN2.

Each of the second group 84 of phase-shift switching elements is coupled between a corresponding one of the second group 70 of RF phase-shifting circuits and the second common connection node CN2. Specifically, the second antenna first phase-shift switching element 86 is coupled between the second antenna first RF phase-shifting circuit 78 and the second common connection node CN2. The second antenna second phase-shift switching element 88 is coupled between the second antenna second RF phase-shifting circuit 80 and the second common connection node CN2. The second antenna M^(TH) phase-shift switching element 90 is coupled between the second antenna M^(TH) RF phase-shifting circuit 82 and the second common connection node CN2.

FIG. 8 shows details of the configurable RF TX/RX multiplexer 18 illustrated in FIG. 2 according to an additional embodiment of the configurable RF TX/RX multiplexer 18. The configurable RF TX/RX multiplexer 18 illustrated in FIG. 8 is similar to the configurable RF TX/RX multiplexer 18 illustrated in FIG. 7, except in the configurable RF TX/RX multiplexer 18 illustrated in FIG. 8, the first group 28 of RF RX bandpass filters is not shown to simplify FIG. 8 and details of the second group 66 of RF receive bandpass filters are shown. The second group 66 of RF receive bandpass filters includes a second antenna first RF RX bandpass filter 92, a second antenna second RF RX bandpass filter 94, and up to and including a second antenna N^(TH) RF RX bandpass filter 96.

In one embodiment of the second group 66 of RF receive bandpass filters, each of the second group 66 of RF receive bandpass filters is coupled to the second common connection node CN2. As such, the second antenna first RF RX bandpass filter 92 is coupled to the second common connection node CN2. The second antenna second RF RX bandpass filter 94 is coupled to the second common connection node CN2. The second antenna N^(TH) RF RX bandpass filter 96 is coupled to the second common connection node CN2.

The second antenna first RF RX bandpass filter 92 receives and filters the second antenna, first RF receive signal R2A1 (FIG. 2) via the second common connection node CN2 to provide the second antenna, first upstream RF receive signal R2U1. The second antenna second RF RX bandpass filter 94 receives and filters the second antenna, second RF receive signal R2A2 (FIG. 2) via the second common connection node CN2 to provide the second antenna, second upstream RF receive signal R2U2. The second antenna N^(TH) RF RX bandpass filter 96 receives and filters the second antenna, N^(TH) RF receive signal R2AN (FIG. 2) via the second common connection node CN2 to provide the second antenna, N^(TH) upstream RF receive signal R2UN. In general, the second group 66 of RF receive bandpass filters provides the first group of second antenna, upstream RF receive signals R2U1, R2U2, R2UN.

In an alternate embodiment of the second group 66 of RF RX bandpass filters, any of the second group 66 of RF RX bandpass filters are omitted. In one embodiment of the second group 66 of RF RX bandpass filters, each of the second group 66 of RF RX bandpass filters is directly coupled to the second common connection node CN2.

FIG. 9 shows details of the configurable RF TX/RX multiplexer 18 illustrated in FIG. 1 and the first RF antenna 16 according to one embodiment of the configurable RF TX/RX multiplexer 18 and the first RF antenna 16. The configurable RF TX/RX multiplexer 18 includes the group 26 of RF TX bandpass filters, the first group 28 of RF RX bandpass filters, the first group 30 of RF TX switching elements, a first antenna-facing quadrature RF power splitter/combiner (QRFPSC) 98, and a first group 100 of QRFPSCs. Additionally, the configurable RF TX/RX multiplexer 18 has the first common connection node CN1. The group 26 of RF TX bandpass filters and the first group 30 of RF TX switching elements illustrated in FIG. 9 are similar to the group 26 of RF TX bandpass filters and the first group 30 of RF TX switching elements illustrated in FIG. 3. The first group 28 of RF RX bandpass filters includes a first group 102 of in-phase RF RX bandpass filters and a first group 104 of quadrature-phase RF RX bandpass filters.

The first group 102 of in-phase RF RX bandpass filters includes a first in-phase RF RX bandpass filter 106, a second in-phase RF RX bandpass filter 108, and up to and including an N^(TH) in-phase RF RX bandpass filter 110. The first group 104 of quadrature-phase RF RX bandpass filters includes a first quadrature-phase RF RX bandpass filter 112, a second quadrature-phase RF RX bandpass filter 114, and up to and including an N^(TH) quadrature-phase RF RX bandpass filter 116. The first group 100 of QRFPSCs includes a first QRFPSC 118, a second QRFPSC 120, and up to and including an N^(TH) QRFPSC 122.

Each of the first antenna-facing QRFPSC 98 and the first group 100 of QRFPSCs includes a corresponding isolation port SP, main port MP, and pair of quadrature ports 0 DEG, 90 DEG. The pair of quadrature ports 0 DEG, 90 DEG includes an in-phase port 0 DEG and a quadrature-phase port 90 DEG. The first antenna-facing QRFPSC 98 is coupled between the first RF antenna 16 and the first common connection node CN1. The first antenna-facing QRFPSC 98 is further coupled between the first group 28 of RF RX bandpass filters and the first RF antenna 16. The first group 100 of QRFPSCs is coupled to the first group 28 of RF RX bandpass filters.

In one embodiment of the first antenna-facing QRFPSC 98 and the first group 100 of QRFPSCs, each of the first antenna-facing QRFPSC 98 and the first group 100 of QRFPSCs are hybrid RF couplers. In one embodiment of the first antenna-facing QRFPSC 98, the first antenna-facing QRFPSC 98 includes a corresponding group of acoustic-based RF resonators (ABRFR)s. In one embodiment of the first group 100 of QRFPSCs, each of the first group 100 of QRFPSCs includes a corresponding group of ABRFRs. In one embodiment of the first group 28 of RF RX bandpass filters, the first group 28 of RF RX bandpass filters includes a corresponding group of ABRFRs. In one embodiment of the second group 66 (FIG. 8) of RF receive bandpass filters, the second group 66 of RF receive bandpass filters (FIG. 8) includes a corresponding group of ABRFRs.

In one embodiment of the configurable RF TX/RX multiplexer 18, the first in-phase RF RX bandpass filter 106 is coupled between an in-phase port 0 DEG of the first QRFPSC 118 and an in-phase port 0 DEG of the first antenna-facing QRFPSC 98. The second in-phase RF RX bandpass filter 108 is coupled between an in-phase port 0 DEG of the second QRFPSC 120 and the in-phase port 0 DEG of the first antenna-facing QRFPSC 98. The N^(TH) in-phase RF RX bandpass filter 110 is coupled between an in-phase port 0 DEG of the N^(TH) QRFPSC 122 and the in-phase port 0 DEG of the first antenna-facing QRFPSC 98.

In one embodiment of the configurable RF TX/RX multiplexer 18, the first quadrature-phase RF RX bandpass filter 112 is coupled between a quadrature-phase port 90 DEG of the first QRFPSC 118 and a quadrature-phase port 90 DEG of the first antenna-facing QRFPSC 98. The second quadrature-phase RF RX bandpass filter 114 is coupled between a quadrature-phase port 90 DEG of the second QRFPSC 120 and the quadrature-phase port 90 DEG of the first antenna-facing QRFPSC 98. The N^(TH) quadrature-phase RF RX bandpass filter 116 is coupled between a quadrature-phase port 90 DEG of the N^(TH) QRFPSC 122 and the quadrature-phase port 90 DEG of the first antenna-facing QRFPSC 98.

In one embodiment of the first group 100 of QRFPSCs, the first QRFPSC 118 provides the first antenna, first upstream RF receive signal R1U1 via a main port MP of the first QRFPSC 118. The second QRFPSC 120 provides the first antenna, second upstream RF receive signal R1U2 via a main port MP of the second QRFPSC 120. The N^(TH) QRFPSC 122 provides the first antenna, N^(TH) upstream RF receive signal R1UN via a main port MP of the N^(TH) QRFPSC 122.

In one embodiment of the first group 100 of QRFPSCs each of the first group 100 of QRFPSCs has a corresponding isolation port SP. As such, each corresponding isolation port SP of any or all of the first group 100 of QRFPSCs may be coupled to any or all of a corresponding group of resistive elements (not shown). Each of the corresponding group of resistive elements (not shown) may be coupled between a corresponding isolation port SP and ground.

FIG. 10 shows details of the configurable RF TX/RX multiplexer 18 illustrated in FIG. 9 according to one embodiment of the configurable RF TX/RX multiplexer 18. The configurable RF TX/RX multiplexer 18 illustrated in FIG. 10 includes an acoustic substrate 124. The acoustic substrate 124 includes the first group 28 of RF RX bandpass filters, the first antenna-facing QRFPSC 98, the first QRFPSC 118, the second QRFPSC 120, and the N^(TH) QRFPSC 122.

The first antenna-facing QRFPSC 98 includes a first group of ABRFRs 126. The first QRFPSC 118 includes a second group of ABRFRs 128. The second QRFPSC 120 includes a third group of ABRFRs 130. The N^(TH) QRFPSC 122 includes a fourth group of ABRFRs 132. The first group 28 of RF RX bandpass filters includes the fifth group of ABRFRs 134. In one embodiment of the first group of ABRFRs 126, the second group of ABRFRs 128, the third group of ABRFRs 130, the fourth group of ABRFRs 132, and the fifth group of ABRFRs 134, each of the first group of ABRFRs 126, the second group of ABRFRs 128, the third group of ABRFRs 130, the fourth group of ABRFRs 132, and the fifth group of ABRFRs 134 includes surface acoustic wave (SAW) RF circuitry.

In one embodiment of the first group of ABRFRs 126, the second group of ABRFRs 128, the third group of ABRFRs 130, the fourth group of ABRFRs 132, and the fifth group of ABRFRs 134, each of the first group of ABRFRs 126, the second group of ABRFRs 128, the third group of ABRFRs 130, the fourth group of ABRFRs 132, and the fifth group of ABRFRs 134 includes bulk acoustic wave (BAW) RF circuitry.

FIG. 11A shows details of the first group of ABRFRs 126 illustrated in FIG. 10 according to one embodiment of the first group of ABRFRs 126. The first group of ABRFRs 126 includes a pair of in-line coupled ABRFRs 136 and a pair of cross-coupled ABRFRs 138. One in-line coupled ABRFR 136 is coupled between the main port MP and the in-phase port 0 DEG. Another in-line coupled ABRFR 136 is coupled between the isolation port SP and the quadrature-phase port 90 DEG. One cross-coupled ABRFR 138 is coupled between the main port MP and the quadrature-phase port 90 DEG. Another cross-coupled ABRFR 138 is coupled between the isolation port SP and the in-phase port 0 DEG.

FIG. 11B shows details of the fifth group of ABRFRs 134 illustrated in FIG. 10 according to one embodiment of the fifth group of ABRFRs 134. The fifth group of ABRFRs 134 includes multiple series-coupled ABRFRs 140 and multiple shunt-coupled ABRFRs 142. In general, two or more series-coupled ABRFRs 140 are coupled in series with one another. The series-coupled ABRFR 140s may be used to form multiple series couplings. In general, a shunt-coupled ABRFR 142 may be coupled between ground and a coupling between two series-coupled ABRFRs 140.

FIG. 12 shows details of the configurable RF TX/RX multiplexer 18 illustrated in FIG. 2 according to one embodiment of the configurable RF TX/RX multiplexer 18. The configurable RF TX/RX multiplexer 18 illustrated in FIG. 12 is similar to the configurable RF TX/RX multiplexer 18 illustrated in FIG. 9, except the second RF antenna 24 is shown in FIG. 12 and the configurable RF TX/RX multiplexer 18 further includes the second group 66 of RF receive bandpass filters, the second group 68 of RF TX switching elements, a second antenna-facing QRFPSC 144, a second group 146 of QRFPSCs and the second common connection node CN2.

The second group 68 of RF TX switching elements is coupled between the group 26 of RF TX bandpass filters and the second common connection node CN2. As such, each of the second group 68 of RF TX switching elements is coupled between a corresponding one of the group 26 of RF TX bandpass filters and the second common connection node CN2. The second antenna-facing QRFPSC 144 is coupled between the second RF antenna 24 and the second common connection node CN2. In this regard, a main port MP of the second antenna-facing QRFPSC 144 is coupled to the second common connection node CN2 and an isolation port SP of the second antenna-facing QRFPSC 144 is coupled to the second RF antenna 24.

Additionally, the second antenna-facing QRFPSC 144 is coupled between the second group 66 of RF receive bandpass filters and the second RF antenna 24. Specifically, the second group 66 of RF receive bandpass filters is coupled to an in-phase port 0 DEG and a quadrature-phase port 90 DEG of the second antenna-facing QRFPSC 144. The second group 66 of RF receive bandpass filters is coupled to the second group 146 of QRFPSCs, which provides the second antenna, first upstream RF receive signal R2U1, the second antenna, second upstream RF receive signal R2U2, and up to and including the second antenna, N^(TH) upstream RF receive signal R2UN.

FIG. 13 shows details of the configurable RF TX/RX multiplexer 18 illustrated in FIG. 1 according to one embodiment of the configurable RF TX/RX multiplexer 18. The configurable RF TX/RX multiplexer 18 illustrated in FIG. 13 is similar to the configurable RF TX/RX multiplexer 18 illustrated in FIG. 3, except the configurable RF TX/RX multiplexer 18 illustrated in FIG. 13 further includes a TDD front-end circuit 148, a TDD RF switching element 150, and a TDD RF RX switching element 152.

The TDD RF RX switching element 152 is coupled between the first common connection node CN1 and each of the first group 28 of RF RX bandpass filters. The TDD RF switching element 150 is coupled between the first common connection node CN1 and the TDD front-end circuit 148. The configurable RF TX/RX multiplexer 18 operates in one of a normal operating mode, a TDD receive mode, and a TDD transmit mode. During the normal operating mode, the TDD RF switching element 150 is OPEN and the TDD RF RX switching element 152 is CLOSED. As such, the TDD front-end circuit 148 does not significantly load the first common connection node CN1.

During the TDD receive mode, the TDD RF switching element 150 is CLOSED and the TDD RF RX switching element 152 is OPEN. By opening the TDD RF RX switching element 152, the first group 28 of RF RX bandpass filters is substantially isolated from the first common connection node CN1, thereby reducing insertion loss. Additionally, during the TDD receive mode, the TDD front-end circuit 148 provides a TDD RX signal TDD RX.

During the TDD transmit mode, the TDD RF switching element 150 is CLOSED and the TDD RF RX switching element 152 is OPEN. By opening the TDD RF RX switching element 152, the first group 28 of RF RX bandpass filters is substantially isolated from the first common connection node CN1, thereby reducing insertion loss. Additionally, during the TDD transmit mode, the TDD front-end circuit 148 receives and forwards a TDD TX signal TDD TX.

FIG. 14 shows the RF communications circuitry 10 according to one embodiment of the RF communications circuitry 10. The RF communications circuitry 10 illustrated in FIG. 14 is similar to the RF communications circuitry 10 illustrated in FIG. 1, except in the RF communications circuitry 10 illustrated in FIG. 14; during the TDD transmit mode, the RF transmit circuitry 22 provides the TDD TX signal TDD TX to the configurable RF TX/RX multiplexer 18; and during the TDD receive mode, the configurable RF TX/RX multiplexer 18 provides the TDD RX signal TDD RX to the RF receive circuitry 20.

Some of the circuitry previously described may use discrete circuitry, integrated circuitry, programmable circuitry, non-volatile circuitry, volatile circuitry, software executing instructions on computing hardware, firmware executing instructions on computing hardware, the like, or any combination thereof. The computing hardware may include mainframes, micro-processors, micro-controllers, DSPs, the like, or any combination thereof.

None of the embodiments of the present disclosure are intended to limit the scope of any other embodiment of the present disclosure. Any or all of any embodiment of the present disclosure may be combined with any or all of any other embodiment of the present disclosure to create new embodiments of the present disclosure.

Those skilled in the art will recognize improvements and modifications to the preferred embodiments of the present disclosure. All such improvements and modifications are considered within the scope of the concepts disclosed herein and the claims that follow. 

What is claimed is:
 1. A configurable RF transmit/receive (TX/RX) multiplexer comprising: a plurality of RF TX bandpass filters; a first plurality of RF TX switching elements, wherein each of the first plurality of RF TX switching elements is coupled between a corresponding one of the plurality of RF TX bandpass filters and a first common connection node, which is coupled to a first RF antenna; a first plurality of RF RX bandpass filters, wherein each of the first plurality of RF RX bandpass filters is coupled to the first common connection node; and a first plurality of RF phase-shifting circuits, wherein each of the first plurality of RF phase-shifting circuits is coupled between a corresponding one of the plurality of RF TX bandpass filters and a corresponding one of the first plurality of RF TX switching elements.
 2. A configurable RF transmit/receive (TX/RX) multiplexer comprising: a plurality of RF TX bandpass filters; a first plurality of RF TX switching elements, wherein each of the first plurality of RF TX switching elements is coupled between a corresponding one of the plurality of RF TX bandpass filters and a first common connection node, which is coupled to a first RF antenna; a first plurality of RF RX bandpass filters, wherein each of the first plurality of RF RX bandpass filters is coupled to the first common connection node; and a first plurality of RF phase-shifting circuits and a first plurality of phase-shift switching elements, wherein each of the first plurality of phase-shift switching elements is coupled between a corresponding one of the first plurality of RF phase-shifting circuits and the first common connection node, such that during transmission of an RF antenna TX signal via the first RF antenna, one of the plurality of RF TX bandpass filters and a corresponding one of the first plurality of RF phase-shifting circuits are operationally coupled to the first RF antenna.
 3. The configurable RF TX/RX multiplexer of claim 2 wherein during a time-division duplex (TDD) reception of an RF antenna RX signal via the first RF antenna, one of the first plurality of RF phase-shifting circuits is operationally coupled to the first RF antenna.
 4. The configurable RF TX/RX multiplexer of claim 1 wherein a selected one of the plurality of RF TX bandpass filters is configured to receive and filter a corresponding one of a plurality of RF TX signals, such that an RF antenna TX signal is based on the corresponding one of the plurality of RF TX signals, and the first RF antenna is configured to transmit the RF antenna TX signal.
 5. The configurable RF TX/RX multiplexer of claim 1 wherein at least two of the first plurality of RF RX bandpass filters are configured to simultaneously receive and filter a corresponding plurality of RF antenna RX signals to provide a corresponding plurality of RF RX signals.
 6. A configurable RF transmit/receive (TX/RX) multiplexer comprising: a plurality of RF TX bandpass filters; a first plurality of RF TX switching elements, wherein each of the first plurality of RF TX switching elements is coupled between a corresponding one of the plurality of RF TX bandpass filters and a first common connection node, which is coupled to a first RF antenna; a first plurality of RF RX bandpass filters, wherein each of the first plurality of RF RX bandpass filters is coupled to the first common connection node; a TDD front-end circuit, a TDD RF switching element, and a TDD RF RX switching element; wherein the TDD RF RX switching element is coupled between the first common connection node and each of the first plurality of RF RX bandpass filters, and the TDD RF switching element is coupled between the first common connection node and the TDD front-end circuit.
 7. A configurable RF transmit/receive (TX/RX) multiplexer comprising: a plurality of RF TX bandpass filters; a first plurality of RF TX switching elements, wherein each of the first plurality of RF TX switching elements is coupled between a corresponding one of the plurality of RF TX bandpass filters and a first common connection node, which is coupled to a first RF antenna; a first plurality of RF RX bandpass filters, wherein each of the first plurality of RF RX bandpass filters is coupled to the first common connection node; a first antenna-facing quadrature RF power splitter/combiner (QRFPSC), which is coupled between the first RF antenna and the first common connection node, and further coupled between the first plurality of RF RX bandpass filters and the first RF antenna; and a first plurality of QRFPSCs coupled to the first plurality of RF RX bandpass filters.
 8. The configurable RF TX/RX multiplexer of claim 7 wherein each of the first antenna-facing QRFPSC and the first plurality of QRFPSCs comprises a corresponding isolation port, main port, and pair of quadrature ports.
 9. The configurable RF TX/RX multiplexer of claim 8 wherein each of the first antenna-facing QRFPSC and the first plurality of QRFPSCs are hybrid RF couplers.
 10. The configurable RF TX/RX multiplexer of claim 8 wherein each of the first antenna-facing QRFPSC, the first plurality of QRFPSCs, and the first plurality of RF RX bandpass filters comprises a corresponding plurality of acoustic-based RF resonators (ABRFR)s.
 11. The configurable RF TX/RX multiplexer of claim 10 wherein: the first antenna-facing QRFPSC comprises a pair of in-line coupled ABRFRs and a pair of cross-coupled ABRFRs; and each of the first plurality of RF RX bandpass filters comprises a plurality of series-coupled ABRFRs and a plurality of shunt-coupled ABRFRs.
 12. The configurable RF TX/RX multiplexer of claim 10 further comprising an acoustic substrate, which comprises each corresponding plurality of ABRFRs.
 13. The configurable RF TX/RX multiplexer of claim 10 wherein each corresponding plurality of ABRFRs comprises surface acoustic wave (SAW) RF circuitry.
 14. The configurable RF TX/RX multiplexer of claim 10 wherein each corresponding plurality of ABRFRs comprises bulk acoustic wave (BAW) RF circuitry.
 15. The configurable RF TX/RX multiplexer of claim 7 further comprising a second plurality of RF TX switching elements, wherein each of the second plurality of RF TX switching elements is coupled between a corresponding one of the plurality of RF TX bandpass filters and a second common connection node.
 16. The configurable RF TX/RX multiplexer of claim 15 further comprising: a second plurality of RF RX bandpass filters; a second antenna-facing QRFPSC, which is coupled between a second RF antenna and the second common connection node, and further coupled between the second plurality of RF RX bandpass filters and the second RF antenna; and a second plurality of QRFPSCs coupled to the second plurality of RF RX bandpass filters.
 17. The configurable RF TX/RX multiplexer of claim 1 further comprising: a second plurality of RF TX switching elements, wherein each of the second plurality of RF TX switching elements is coupled between a corresponding one of the plurality of RF TX bandpass filters and a second common connection node, which is coupled to a second RF antenna; and a second plurality of RF RX bandpass filters, wherein each of the second plurality of RF RX bandpass filters is coupled to the second common connection node.
 18. The configurable RF TX/RX multiplexer of claim 17 further comprising a second plurality of RF phase-shifting circuits, wherein each of the first plurality of RF TX switching elements; and each of the second plurality of RF phase-shifting circuits is coupled between a corresponding one of the plurality of RF TX bandpass filters and a corresponding one of the second plurality of RF TX switching elements.
 19. A configurable RF transmit/receive (TX/RX) multiplexer comprising: a plurality of RF TX bandpass filters; a first plurality of RF TX switching elements, wherein each of the first plurality of RF TX switching elements is coupled between a corresponding one of the plurality of RF TX bandpass filters and a first common connection node, which is coupled to a first RF antenna; a first plurality of RF RX bandpass filters, wherein each of the first plurality of RF RX bandpass filters is coupled to the first common connection node; a second plurality of RF TX switching elements, wherein each of the second plurality of RF TX switching elements is coupled between a corresponding one of the plurality of RF TX bandpass filters and a second common connection node, which is coupled to a second RF antenna; a second plurality of RF RX bandpass filters, wherein each of the second plurality of RF RX bandpass filters is coupled to the second common connection node; and a first plurality of RF phase-shifting circuits, a first plurality of phase-shift switching elements, a second plurality of RF phase-shifting circuits, and a second plurality of phase-shift switching elements; wherein each of the first plurality of phase-shift switching elements is coupled between a corresponding one of the first plurality of RF phase-shifting circuits and the first common connection node; and each of the second plurality of phase-shift switching elements is coupled between a corresponding one of the second plurality of RF phase-shifting circuits and the second common connection node. 